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No. 607,l76. Y Patented July l2, I898.

' E. F. GWYNN.

DEVICE FOR REMOVING SCALE FROM BDILER TUBES.

' (Application filed July 21, 1897.)

(No Model.)

/////////////l1W///////////////////A7////A I Nrrn TATES EDWARD F.GWVYNN,

OF DELAXVARE, OHIO.

DEVICE FOR REMOVING SCALE FROM BOILER-TUBES.

SPECIFICATION forming part of Letters Patent No. 607,168, dated July 12,1898. Application filed July 21,1897. Serial No. 645,359. (No model.)

To 66 whom, it may concern Be it known that I, EDWARD F. GWYNN, acitizen of the United States, residingat Delaware, in the county ofDelaware and State of Ohio, have invented a certain new and usefulImprovement in Devices for Removing Scale from Boiler-Tubes, of whichthe following is a specification.

My invention relates to devices for removing scale from boiler-tubes;and the objects of my invention are to provide an improved device ofthis class of such construction and arrangement as to admit of itsinsertion and use within the tubes of boilers and to produce otherimprovements the details of construction and arrangements of parts ofwhich will be more fully pointed out hereinafter. These objects Iaccomplishin the manner illustrated in the accompanying drawings, inwhich-v Figure 1 represents in section a portion of the tubes of aboiler, my improved scale loosening and removing device being shown inposition for use in one of the said tubes. Fig. 2 is a centrallongitudinal section of. my improved device, taken on line m x of Fig.4:. Fig. 3 is a transverse section on line y y of Fig. 4, and Fig. 4 isa plan View of my device.

Similar letters refer to similar parts throughout the several Views.

In the construction of my improved scaleremoving device I employasubstantially cylindrical body or head a, the latter being provided atits rear end with an eccentricallylocated neck extension I). Extendingthrough the neck portion Z) and into the body a is a horizontal passage0. The forward end of this passage 0 communicates at its inner end witha passage or opening 0, which leads outward through the side of the bodyain a direction at right angles with the passage 0.

Between the passage 0 and the forward end of the body or head a Iprovide the latter with a peripheral shoulder d.

lVithin the passage-arm c is arranged to fit and slide a hammer-head e,the outwardlyextending end of which is rounded or formed convex, asindicated at c. This hammer e is normally retained in the positionshownin the drawings by means of a suitable springstrip a", one end of whichis secured to the body a and" the remaining end of which e11- gages witha peripheral groove f, formed in the outwardly-projecting endportion ofthe hammer e. The inner end of the hammer e is, as indicated in -the'dr'awings, provided with'a suitable packing-disk'g, of leather orsimilar material.

Extending within the passage 0 through the neck portion 1) is a plungerh, the inner end of the latter being provided with a suitable packingdisk 7L. nected with its outer end portion an extension or hammer rod7L2, which may be of any desirable length. Upon the neck extension I) ofthe body a is secured a tube i, which loosely incases-a portion of theplunger extension h At its outer end the tube i'has suitably securedthereto the desired number of outwardly-extendingarms 7s. The spacebetween the inner end of the hammer e and the inner end of the plunger his adapted to be filled with a suitable liquid.

For utilizing my invention the head a and a necessary portion of theextension 7L and tube 2' is, as indicated in Fig. 1 of the drawings,inserted within a tube m of a boiler. This being accomplished the strokeof a hammer against the outer end of the plunger extension 7L2 mustresult, as will readily be seen, in the inward movement of the saidplunger and a consequent compression of the liquid contained between theplunger and the hammer. The stroke imparted to the plunger is thuscontributed through the compression of the liquid to the hammer a,resulting in an outward stroke of the latter. These strokes of thehammer against the inner surface of the boiler-tubes, successivelyadministered, must result, as will readily be seen, not only inloosening but removing any scale or other foreign matter which may clingto the surface of the tube.

It will be observed that the shoulder d is of such circumference as toprovide a bearing for the head a within the tube and that the head ofthe hammer e is so supported as to be normally in contact with or inclose proximity to the inner surface of the tube. Said hammer being thuslimited in its movement it is obvious that the blow imparted to Theplunger 7L has con-' the tube is in the nature of a quick jar orconcussion which, while not injuring the tube, results in removing thescale therefrom.

It is evident that the head a may be rotated within the tube to anydesired position and that this rotation is facilitated by turning thehandle or arms 71':- It is also evident that the head may be thrownoutward or inward, so as to apply the stroke of the hammer to anydesired point on the inner surface of the tube.

Although the stroke on the plunger extension is described herein asimparted by the hand, it is obvious that any well known means may beemployed in imparting successive strokes to said plunger extension.

It will be observed that my improved scaleremoving device is of suchconstruction and form as to admit of its being produced at a low cost tomanufacture and of its being readily and effectively placed in use.

If desired, I may form within the head a one or more additionalpassagearms 0, thus admitting of the employment of additional hammers e,which would be operated simultaneously by one blow on the plunger.

Having now described my invention, what I claim, and desire to secure byLetters Patent, is-

1. In a device for removing scale from boiler-tubes, the combinationwith a body adapted to be inserted within a boiler-tube, said bodyhaving an angular passage therethrough, of a hammer contained in one armof said passage, a movable plunger contained in the other arm of saidpassage and a quantity of liquid between said plunger and hammer,substantially as and for the purpose specified.

2. In a device for removing scale from boiler-tubes, the combinationwith a body adapted to be inserted within a tube, said body having anangular passage therethrough, of a hammer movably retained in one arm ofsaid passage, a plunger adapted to move in the remaining passage-arm, atubular neck extension of said body, a handle-arm extending therefromand a quantity of liquid contained between said plunger andhammer,'substantially as and for the purpose specified.

3. In a device for removing scale from boiler-tubes, the combinationwith a body adapted to be inserted and rotated within the tube, saidbody having an angular passage therethrough and a peripheral shoulder onsaid body of a hammer movably fitting in one arm of said passage, agroove in the head of said hammer, a spring secured to the body andengaging in said hammer-groove, a plunger movably contained in theremaining arm of said passage, a quantity of liquid contained in thepassage between the hammer and plungerand meansforimparting successiveblows to said plunger, substantially as and for the purpose specified.

I S. KARSHNEi-i, U. C. SHEPHERD.

